Baudelot water cooler



E. G. LEHMAN BAUDELOT WATER COOLER 2 Sheets-Sheet 1 Filed June 7. 19593nventor (Zttornegs E. G. LEHMAN BAUDELOT WATER cboLER May 14, 1940.

2 Sheets-Shet 2 Filed June 7, 1959 v V I 3nventor 526mb efefmuq/wGttomegs Patented May 14, 1940 UNITED STATES PATENT OFFICE.

2,200,426 IBAUDELOT WATER coon-1n.-

Edward G. Lehman, York, Pa., assignor to York- Ice MachineryCorporation, York. Pa., a corporation of Delaware Application June 7,1939. Serial No. 277,943

Claims. (61. 257-256) 5 ing and in cooling potable liquids, particularlyI water and milk in which extremely-high stand ards' of sanitationimpose correspondingly high,

standards of finish and ease of cleaning.

Non-corrosive steels are now considered the l0 ideal material, but theiruse requires the manufacture of precise steel stampings which are welded together to produce the finished plate or leaf. The die costs arehigh and the market rather limited, so design of aplate in such a waythat identical stampings can be used is a matter, of

more than usualimportance. v

The present invention provides a plate composed of two main stampingswhich are identical and hence can be produced by a single set of dies.

Similarly the in and out connection'flttings are identical and aresymmetrically attached to respective main stampings. This isadvantageous from the standpointof economy and also because the fittingsdo not connect through the joint between the two stain-pings. Thispermits better and-stronger joints to be made.

' Finally the number of flovf passes in a complete plate or leaf is notdependent on the design of the stampings but is determined by insertswhich are welded in place before'the two main stampings' are "assembledwith each other and welded. I

Hence, a single set of dies can produce plates of a given size andconfiguration which difier from each other in the number of passes,arrangement of passes,- or both.

' It is even possible to use more than one inlet and more thanonemutletfand tosegregate from each other distinct portions and passesin a single plate, adapted for heat exchange fluids of differenttemperatures... ,However. double path plates areknown and sincethe-elaboration involves only duplication and mechanical skill inapplying the invention present in a single path plate, a simplecommercial embodiment has been chosen for illustration and detaileddiscussion and as the in one header boss near its end, and the metal isbasis of claims, but with the understanding that various specificallydifferent embodiments are possible within the scope of the'invention.

In the drawings:

Fig. 1 is a face elevation of a simple plate with one inlet and oneoutlet connection. Portions are broken out to reduce both the height andwidth or the view, with the result that 'the co nections appear at firstglance to be out of scale ,with the plate.

Fig. 2 is a right-hand edge view of the plate of Fig. 1 (i. e. lookingto the left at Fig. 1).

Fig. 3 is a section in theline 3-3 of Fig. l. Fig. 4 is a perspectiveview of the two main stampings before wel'ding together, each with the.5

corresponding flow connection attached. T In this view the stamping tothe left is viewed from its external (relief) side and that to therightfrom the internal (intaglio) side, with the pass-defining insertsin place. ings which are identical are shown ready for assembly andwelding.

Fig. 5 is a perspective view of one of the inserts. Fig. 6 is aperspective view showing the insert welded in place. 15

Fig. 7 is a fragmentary vertical section showing the formation of thepasses and the seam-welds between them.-

The two main plate stampings II are identical and hence made in the samedies. They are as- 20 sembled in such a way that if either stamping IIwere rotated about a horizontal axis at its; mid height and in themating plane it would assume the position of the other stamping. State-I ments of direction just made refer to Fig. 1 .7 25

The median plane of the complete leaf,'which.is the mating plane onwhich the main weld is made is the plane of the inner face of themarginal flange l2. .Adjacent this flange are two vertical header bossesl3, both struck out from the 30 median plane. Connecting the two headerbosses l3 are a plurality of horizontal pass bosses I, also struck outfrom the median plane and merge ing with the headers. i i 1 The headerbosses l3 are senii cylindrical and 35 where two plates areassembledform vertical tubular headers circular in cross section (seeFig. 3). The horizontal pass bosses ll amount really to a series ofcorrugations, the corrugations of the two stampings contacting on themedian plane on successive inner crests, and there seam welded asindicated at 15 (Fig. 7). The welds l5 are in the plane of the mainmarginal welds l6 which connect the flanges 1'2.

. In forming the main stampings a slot is formed 45 Dressed to form aflange I! which with the ad.ia. cent portion of the marginal flange I 2Iowa socket to receive the end of the flattened flaring fitting". 'Twostayplates iii are welded into the 5 flattened mouth of the flttingtoresist distortion as bestshown in Figs. 2 and 3, the fitting is is uThus the two main stamp- 10 oflset so that the threaded nipple 2l, whichis .welded to it at 22 is centered on the median because it gives gooddistribution to the several horizontal passes which provide for thefirst flow across the plate, and similarly provides for smooth flow tothe outlet from the last pass. The fact that it enters the headertangentially (see Fig. 3) is also a. valuable feature contributing togood distribution.

Since the inlet and outlet connections are on the same vertical edge ofthe plate, an even number of flow paths across the plate and back areneeded. Heretofore, this has been provided for in the stamping of theplate. An important feature of the present invention is the use of flowdirecting means which may be variously located in the headers before thetwo main stampings are welded. Thus, a single design of stamping can be.used to produce plates which are externally'iden" tical, but which havedifferent pass arrangements.

The flow directing means takes the form of an insert 23 which serves asa barrier (Figs. 5 and 6). The insert 23 is generally circular toconform to the internal contour of the header. -It has small projections24, 25. These are formed to fit, respectively, the reverse curve leadingto the weld H5 (in the plane of one of which welds the insert 23 ismounted), and the slight filletsbetween flanges l2 and respective headerbosses I 3.

Each insert 23 except along the projections 24, 25, has a flange,26,,21' Before the stampings II are welded together the fittings I8 arewelded in place and the inserts 23 are mounted in proper position, eachinsert being spot welded to a stamping at points in a flange 26 or 21.

Then the two stampings are clamped together in proper relativepositions, and the flange welds iii are made. Next the seam welds i5 aremade.

The order in which the welds l5 and 18 are made can be varied.

It is unnecessarjto weld the second flange 26 or 21 of the inserts 23,but this can be done if desired. It is not necessary that the inserts 23seal absblutely tightly, and since they can easily be made substantiallytight, the extra expense ofif assuring absolute tightness is usually notjustied. With these inserts 23 located asshown on the right-handstamping of Fig. ,4, four passes would be provided. One insert wouldgive two passes, five inserts would give six passes, an so on.

After the welding operation is comp eted, the welds are ground and theentire leaf is polished. In use the plate is mounted in a vertical planewith the headers vertical (Fig. 1). A heating or cooling fluid iscirculated through the plate entering at one connection l8 and leavingat the other. Volatile refrigerants may be evaporated in, or vapors maybe condensed in the leaf, since it is well stayed against distortion byinternal or external pressures. The liquid to be cooled I or heated istrickled over the plate according to the usual practice with "Baudelotcoolers.

The advantages offered by the invention are important. The design issimple, so that the dies are comparatively simple to make. Only one setof dies is required and can produce blanks for exchangers of variouspass arrangements. The

flow characteristics are good for both the internal fluid and theexternal liquid. An exceptionally smooth external finish is easilyattainable. Mechanical strength is good. 1

The construction of various specifically differentheat exchange leavesaccording to the invention is contemplated, so that detailed descriptionhere given is to be taken as illustrative and not limiting.

What is claimed is:

1. A heat exchange plate comprising two identical sheet metal stampingshaving peripheral mating fiangeswelded together,'the'mating faces of theflanges being in the median plane of the plate, each stamping having twoparallel header channel bosses pressed outward from said median plane,and pass channel bosses forming channels connecting the header channelsand also pressed outward from said median plane, each stamping having anopening partially bounded by a seat formed in the wall of a headerchannel, said opening being near the end of the channel-and outside butadjacent to said peripheral flange whereby the flange forms thecomplemental portion oi -said seat; and flow connection fittings weldedto said seats and to said flanges.

2. A heat exchange plate comprising two identical sheet metal stampingshaving peripheral mating flanges welded together, the mating faces ofthe flanges being in the median plane of the plate, each stamping havingtwo parallel header channel bosses pressed outward from said medianplane, and pass channel bosses forming channels connecting the headerchannels and also pressed outward from said median plane, each stampinghaving an opening partially bounded by a seat formed in the wall of aheader channel, said opening being near thefiend of the channel andoutside but adjacent to said peripheral flange whereby the flange formsthe complemental portion,of said seat; and flow connection fittingswelded to said seats and to said flanges, the openings being plate,eachstamping having two parallel header channel bosses pressed outwardfrom the plane of the flanges, and pass-channel bosses forming channelsconnecting the header channels and pressed outward from the medianplane, each stamping having an opening surrounded by a seat formed inthe wall of a header channel near the end thereof and outside saidperipheral flange; flow connection fittings welded to said seats andarranged to direct flow in a direction tangential to said header; and atleast one insert welded in a header channel and obstructing the headerformed by mating channels in the two stampings whereby at least twosuccessive flow passes formed by pass channels between said flowconnection fittings are afforded.

'4. A heat exchange plate comprising two identical sheet metal stampingshaving peripheral mating flanges welded together, the mating faces ofthe flanges being in the median plane of the plate. each stamping havingtwo parallel header formed in the wall oi a header channel near the endthereoi and outside said peripheral flange:

. flow connection fittings welded to said seats and arranged todirectflow in a direction tangential to said header, said seats beingelongated in the direction of the length of the header and the fitvmating flanges welded together, the mating faces of the flanges being inthe median plane of the plate, each stamping havingtwo parallel headerchannel bosses pressed outward from the plane of the flanges, and passchannel bosses forming channels connecting the header channels andpressed outward from the median plane, each stamping having an openingsurrounded by a seat formed in the wall of a header channel near the endthereof and outside said peripheral flange; flow connection fittingswelded to said seats and terminating in circular nipples. said fittingsbeing so onset that the axes of said nipples lie in said median plane;and at least one insert welded in ill a header channel and obstructingthe header formed by mating channels in the two stampings whereby atleast two successive flow passes through passes formed by pass channelsbetween said flow connection fittings are afforded.

